Cloth-presser mechanism for sewing-machines.



J. C. RINGE.

CLOTH PRESSER MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAY 11, 915.

Patented Oct. 24, 1916.

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reference being had'ther'eintofthe accompanying drawings.

This invention relates to meansifor resiliently holding the cloth pre'sser of sew-- ing machine down upon the fabric-beings acted on, and has for its object the providing of a self-locking adjusting screw, the latter, in its movements to change the degree of pressure, indicating to the operator.

the degree of adjustment effected, so that when changing any given adjustment, the latter may be again restored without probable error on the part of the operator.

In the operation of stitching together materials it frequently is desirable to change the degree of pressure exerted by the cloth presser, and often this is an advantage in the formation of a single seam, as when stitching together unevenly distributed superposed plies of leather or when the seam is directed from a comparatively thin fabric to the stitching in of a comparatively thick or heavy material, and to better adapt the cloth presser mechanism to the requirement of the stitching operation under varying conditions of materials and their arrangement, is the purpose of the present .invena rear-side elevation of one variety of a Singer sewing machine equipped with the present invention, Fig. 2 a front-end elevation of the bracket-arm shown in the. previous figures. Fig. 3 is a detail of the clothpresser spring adjusting screw, Fig. 4 a plan of the rear-end portion of the clothpresser spring and Fig. 5 a central section of Fig. 4.

As the present invention relates only to the construction and application of the cloth-presser mechanism only so much of the sewing machine has been illustrated as is deemed necessary for a proper understanding of its application.

Referring to the drawings, 1 represents the bed-plate of a sewing machine upon I v p for ti'c'ersras Application' f lerllvlja. 11,1915.

main shaft flange, operatively connected b "ISM r03 Wa d, Oct; 24, 9 5 serial -127,3

which ismounted the bracket-arm ing the arm standard2 and arm-bracket 3,

4E -the'hand .orband-wheel carried by the main or needle-ban drivingsha-ftl9, .5 the link ,6 with the needle-carryingbar 7,: 8; the needle-thread.'takerup operatively connected with said xshaft' flange and 9 the needlethread. te s r h 10 represents the I clothpresser carrying bar mounted to move vertically in the tubular bushing- 11 suitably secured in the lower :end "of the head 12 of the arm-bracket, the

upper end of said cloth-presser carrying bar being provided with a pinch collar 13, later to be referred to.

14 denotes a cloth-presser spring provided with a holding pin 15 and a comparatively shallow V-shaped notch 16, the rear end of said spring resting on the body portion of the screw 18 threaded into the arm-bracket and confined between the latter and the head of said screw with the pin 15 entering a suitable opening (not shown) in said arm bracket, the opposite free end of said clothpresser spring being seated upon the upper rounded end 20 of said cloth-presser carrying bar, which latter, at its lower end, is provided with a cloth-presser 21. j

22 represents a vertically arranged guidebar suitably secured in the head 12 and upon which is mounted to move vertically a sleeve 23 having formed integral with it a presserbar lifting lug 24: and cam-lug 25, the latter acted on by a cam-lever 26 to, through the lug 24, pinch collar 13 and cloth-presser carrying bar 10, raise the cloth-presser 21 off the fabric in opposition to the resiliency of the spring 14:.

27 represents a cloth-presser spring adjusting screw threaded into a lug 28 formed on the arm-bracket, the lower end of said screw being provided with a tapered or chisel-shaped blunt end 29 which, in prac-- tice, cooperates with the notch 16 to lock said adjusting screw against accidental movement at the end of each half turn.

From the foregoing it will be understood that the present. construction dispenses with the employment of the lock or check-nut common to means for holding adjusting screws against accidental rotation, and that each half turn of the adjusting screw, through its engagement with the notch 16 in the cloth-presser spring, indicates to the operator the degree of adjustment effected, thus making it convenient for the operator to change a given adjustment'to that of a greater or lesser resiliency and again restore said given adjustment, at will, without resorting to the common practice of fitting the spring pressure to the requirements by stitching short lengths of seams under changed conditions of spring adjustment until the required pressure is efl'ected. 7

Having thus set'for'th the nature of the invention, whatI claim herein is 1. In a sewing machine cloth-presser mechanism, the combination with a cloth-presser carrying bar and a cloth-presser-bar spring provided with a comparatively shallow V- shaped notch, of a-jcloth-presser-bar adjusting screw havingza, blunt chisel-shaped free end cooperating with said notch to hold said adjusting screwa'gainstaccidental rotation but free to be turned at the will of the operator during t he stitching operation.

2. In a sewing machine cloth-pre'sser mechanism, the combination with a vertically arranged oloth-presser carrying bar and a horizontally arranged cloth-presser-bar spring provided with a comparatively shallow V- shaped notch, of a cloth-presser-bar spring adjusting screw having a blunt chisel-shaped free end cooperating with said notch to hold said adjusting screw against accidental rotation but free to be turned at the will of the operator during the stitching operation. In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

JOHN C. RINGE.

Witnesses:

W. W. DE LANEY, N. H. HOYT.

Copies of this patent may be obtained for flve cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

